These great hollow globes of artificial super-metals, and artificial transparent adamant, ranged in size from the earliest and smallest structures, which were no bigger than a very small asteroid, to spheres considerably larger than the Earth. (Olaf Stapledon, STAR MAKER)
Monday, July 7, 2014
Today's Astronomy Picture of the Day is a radio frequency image of a galaxy (J1502+1115) with three supermassive black holes rather than the more usual one. Why the difference?